Hi guys I am Mark smith working at DRS Softech. It is a software-based company that aims to deliver reliable software for Email Migration and Recovery, and Cloud Migration on Windows OS and Mac. If you want to migrate your data from the MBOX file to the Office 365. I would like to suggest the best tool. Use the DRS MBOX to Office 365 Migration Tool for instant migration
https://www.data-recovery-solutions.com/mbox-to-office365-backup.php